To make the Sleep-Number bed more firm you can add extra layers of foam inside the bed. This 2 minute video shows you how easy it is. If you find that a sleep number of 100 is not hard enough for you, this may be the solution. Generally you add one extra foam insert, raising the air chamber by about one inch or 25 mm. I added two extra layers of foam in this video. However I might decide to reduce it to one extra layer instead of two. You might prefer to put the extra foam UNDER the existing egg crate foam.
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